JP3430765B2 - Band sawing machine for band sawing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension lever for operating a band saw tension device of a band saw board.

[0002]

2. Description of the Related Art A conventional band saw tension device will be described with reference to FIG. Conventionally, the holding member 10 fixed to the frame 2
Saw shaft 12 that slides between and holds the driven saw wheel 4
And a grooved sleeve 11 is attached to the saw shaft 12. There is a protrusion 2a at the rear of the frame 2,
The hole 2b formed in the protrusion 2a has a nut 1 at one end.
The shaft 14 to which 3 is attached is inserted. Shaft 1
4 A compression spring 1 is provided between the nut 13 on the outer periphery and the end surface of the protrusion 2a.
5 are provided. The other end of the shaft 14 has a bolt 1 fixed at a position displaced from the center of the grooved sleeve 11.
7, the shaft 14 and the grooved sleeve 11 are interlocked via bolts 17. When the tension lever 26 provided at the tip of the saw shaft 12 is rotated rightward from the right side by 180 degrees, the grooved sleeve 11 is also rotated and the bolt 1
The shaft 14 moves to the right side in the drawing through 7 and enters the state of FIG. Due to the movement of the shaft 14, the compression spring 15 is compressed to a set length that provides the tensile force required for the band saw 5, and the band saw 5 is stretched.

[0003]

In the conventional band saw tensioning device, when tensioning the band saw 5, the tension of the band saw 5 and the compression spring 1 are used.
The tension lever 26 must be operated against the load of 5. Therefore, the rotating torque and the operating load of the tension lever 26 are large, and it is difficult to tension the band saw 5.

When the tension lever 26 is lengthened to reduce the operation load, the saw wheel 4 and the band saw 5 are moved.
The tension lever 26 protrudes from the saw cover 6 that covers the tension cover 26, and the tension lever 26 cannot be stored in the saw cover 6. In order to store this, the frame 2 and the saw cover 6 have to be enlarged, and the size of the machine body is increased.
It was a factor of cost increase.

Further, in order to reduce the operation load of the tension lever 26 as much as possible, if the tension lever 26 is made as long as possible inside the saw cover 6, the driven saw wheel 4 is provided.
Since the hand may come into contact with the protrusion 2c of the frame 2 or the like, the operator must rotate the tension lever 26 while paying attention to this, and the operability was poor.

An object of the present invention is to eliminate the above-mentioned problems of the prior art and to facilitate the work of tensioning the belt without increasing the size of the machine body. In addition, do not touch the saw wheel or frame when you work on this band,
It is to improve operability.

[0007]

SUMMARY OF THE INVENTION The above object is to slide a saw shaft between two holding members fixed to a frame for accommodating a saw wheel and a band saw, thereby supporting a saw shaft for holding the saw wheel. A grooved sleeve that supports the shaft, a shaft whose one end is axially supported by a bolt that is fixed at a position displaced from the center of the grooved sleeve, and the other end of the shaft that is inserted through a protrusion formed in the frame. Then, a compression spring is provided between the end surface of the protrusion and the shaft, a tension lever for rotating the saw wheel by sliding the grooved sleeve on the end portion of the shaft, and the saw wheel and the band saw. In a band saw board provided with a protective saw cover, a position conversion means for changing a distance between an operation portion which is an operation position of the tension lever and the saw shaft which is a rotation center position, and a tension lever at an arbitrary position. To be fixed Means provided, the distance described above is when the predetermined length is achieved by the tension lever to freely housed in the this cover.

Further, when the distance between the tension lever operation portion and the saw shaft is maximized by the position conversion means and the fixing means, the operation position of the tension lever is higher than that when the tension lever is accommodated in the saw cover. As described above, the tension lever is formed in a substantially "V" shape so that the operating portion is located above and the hand does not come into contact with the protruding portion such as the saw wheel or the frame during the operation.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a band saw board showing an embodiment of the present invention.

In FIG. 1, a frame 2 is pivotally supported in a vertical direction on a right end portion of a base 1 on which a cutting material 27 is placed, with a shaft (not shown) as a pivoting fulcrum. In the frame 2, a driving saw wheel 3 that is rotated by a motor (not shown), a driven saw wheel 4 that rotates from the driving saw wheel 3 through a band saw to be described later, and a saw wheel 3 and 4 are stretched. A band saw 5 is provided. The lower traveling line 5a of the band saw 5 which is partially exposed from the frame 2 is twisted up at a right angle to the upper surface 2a of the base 1 by the band saw guides 9 and 9 arranged on the frame 2. It is held and guided.
The frame 2 is provided with a saw cover 6 which prevents the saw wheels 3 and 4 and the band saw 5 from coming into contact with the frame 2 so as to be vertically openable and closable (in FIG. 1, the saw cover 6 is open). ).

A vice device including a fixed vise 7 and a moving vise 8 is mounted on the base 1, and the moving vise 8 is guided by a groove formed on the upper surface of the base 1 in the longitudinal direction of the base 1. The lower running line of the band saw 5 circulating between the saw wheels 3 and 4 by staking the cutting material 9 against the fixed vise 7 and holding and fixing it with the moving vise 8 and swinging the frame 2 downward. It is cut at 5a.

Next, the construction of the tensioning device for the band saw 5 is shown in FIG.
This will be described with reference to FIGS. 6, 8 and 9. FIG. 5 shows C- of FIG.
Sectional view taken along line C, FIG. 6 is a sectional view taken along line CC of FIG. 3 showing a state where the band saw is loosened, FIG. 8 is a rear view around the saw shaft showing a state where the band saw is stretched, and FIG. It is a rear view of the periphery of the saw shaft showing a state in which the band saw is loosened.

In FIG. 8, the holding members 10 and 10 are arranged so as to be positioned vertically from the center of the driven saw wheel 4.
And the grooved sleeve 11 between the holding members 10 and 10.
Is slidably mounted, and the grooved sleeve 11 fixes the saw shaft 12 that rotatably holds the driven saw wheel 4. There is a protrusion 2a on the rear side of the frame 2, and the protrusion 2a
A shaft 14 having a nut 13 attached to one end is inserted into the hole 2b formed in the above. Nut 13 and protrusion 2a
A compression spring 15 is provided between the end surface and the end surface of the. On the outer periphery of the shaft 14, on the protrusion 2a side of the compression spring 15, there is a locking member 16 that abuts on the stepped portion 14a of the shaft 14 when the band saw 5 is loosened. Before the long). A bolt 17 is pivotally supported from the other end of the shaft 14 toward a position displaced from the center of the grooved sleeve 11.

When a tension lever 18 described later is rotated 180 degrees from left to right (from the state of FIG. 5 to FIG. 6), the grooved sleeve 11 slides between the holding members 10 while rotating, and the bolts 17, When the shaft 14 and the driven saw wheel 4 move from the state shown in FIG. 8 to the state shown in FIG. 9, the locking member 16 comes into contact with the stepped portion 14a of the shaft 14, and the tensile force of the compression spring 15 disappears. When the tension lever 18 is rotated 180 degrees from right to left (from the state of FIG. 6 to FIG. 5), the bolt 17, the shaft 14, and the driven saw wheel 4 move in the opposite manner to the above.
8 to FIG. 8, and at this time, the locking member 16 has the protrusion 2a.
To the stepped portion 14 of the shaft 14 from the locking member 16.
When a is separated, the compression spring 15 is compressed to a set length that provides the tensile force required for the band saw 5.

The structure of the present invention will be described with reference to FIGS. 2 is an enlarged view around the driven saw wheel showing the tension lever stored state, FIG. 3 is an enlarged view around the driven saw wheel showing the tension lever operation state, and FIG. 4 is AA of FIG.
FIG. 7 is a sectional view taken along the line BB of FIG.

In FIG. 7, a width across flat 12a and a screw hole 12b are provided in the axial direction of the tip end of the saw shaft 12. A tension lever 18 for releasing the tension setting of the band saw 5 is attached to the tip of the saw shaft 12,
The tension lever 18 has an operation portion 18b slightly bent upward from the portion A when viewed from FIG. 5, and has a substantially "V" shape as a whole. Further, an elongated hole 18a serving as a position converting means of the tension lever 18 is formed around the vicinity of the portion A, and the elongated hole 18a and the width across flats 12a are fitted to each other to fix the tension lever 18 to the screw hole 12b. The tension lever 18 is sandwiched and fixed between the saw shaft 12 and the knob bolt 19 by screwing and tightening the knob bolt 19 as a means.

In FIG. 4, when the tension lever 18 is fixed while the saw shaft 12 is in contact with the left end of the elongated hole 18a, the distance from the operating portion 18b to the saw shaft 12 is the shortest and the operating portion is short. Since the 18b side is parallel to the upper surface of the driven saw wheel 4, the tension lever 18 can be housed in the saw cover 6. In FIG. 5, when the tension lever 18 is fixed with the saw shaft 12 in contact with the right end of the long hole 18a, the distance from the operating portion 18b to the saw shaft 12 becomes the longest, and the operating portion 18b side is driven. Since it is directed upward with respect to the driven saw wheel 4 away from the saw wheel 4, when the tension lever 18 is rotated, the operation load is small, and the hand is the driven saw wheel 4 or the protrusion 2c of the frame 2 Never come into contact with.

In the above structure, the tension setting of the band saw 5,
When releasing, as shown in FIG. 1, open the saw cover 6 upward, loosen the knob bolt 19, and slide the tension lever 18 to the left until the saw shaft 12 hits the right end of the slot 18a (state of FIG. 3). Let The operation portion 18b is slightly upward with respect to the driven saw wheel 4, and in this state, the knob bolt 19 is tightened to fix the position of the tension lever 18, and the state shown in FIG. 5 is obtained. With this, the tension lever 18
The distance from the operating portion 18b to the saw shaft 12 becomes long. Next, move the tension lever 18 from left to right 180
When it is rotated once (from the state of FIG. 5 to FIG. 6), the grooved sleeve 11 rotates and slides between the holding members 10, so that the bolt 17, the shaft 14, and the driven saw wheel 4 move to move. It becomes a state. At this time, the operation portion 1 of the tension lever 18
Since 8b is facing upward and away from the driven saw wheel 4,
While the tension lever 18 is being rotated, the hand does not touch the driven saw wheel 4 or the protrusion 2c of the frame 2.

In this state, the band saw 5 is attached between the saw wheels 3 and 4, and this time the tension lever 18 is moved from right to left 180
It is rotated once (from the state of FIG. 6 to FIG. 5). By this operation, the bolt 17, the shaft 14, and the driven saw wheel 4 move in the opposite direction to the above. At this time, the tension of the band saw 5 and the compression spring 1
Although the operation load of the tension lever 18 increases due to the load of 5, the distance from the operation point of the tension lever 18 to the saw shaft 12 is long, so that the tension lever 18 can be rotated easily.

When the band saw 5 is stretched, the knob bolt 19 is loosened, the tension lever 18 is slid to the right until the left end of the elongated hole 18a hits the saw shaft 12 (the state shown in FIG. 2), and the knob bolt 19 is tightened. Tension lever 1
8 is shortened to the length that can be stored in the saw cover 6,
It can be stored in the saw cover 6.

Next, a second embodiment of the position converting means of the tension lever 18 of the present invention will be described with reference to FIG. FIG. 10 is a sectional view taken along line AA of FIG. 2 showing the second embodiment.

The position converting means of the tension lever 18 is
The fixed part 20 is fixed to the saw shaft 12, and includes a fixed part 20 having a screw hole 20 a, a movable part 21 having an operation part 21 a, and a rotating part 22 connecting the fixed part 20 and the movable part 21. A knob bolt 19 serving as a fixing means is rotatably attached near the middle of the movable portion 21, and when the movable portion 21 is folded toward the fixed portion 20 side (rightward in FIG. 10) around the rotating portion 22 as a fulcrum, the knob bolt 19 is rotated. 19 is a fixed part 20
It is configured to be screwed into the screw hole 20a.

Normal (when the saw cover 6 is closed)
Since the fixed portion 20 and the movable portion 21 are fixed in an overlapping state by screwing the knob bolt 19 into the screw hole 20a, the tension lever 18 can be stored in the saw cover 6. When tensioning the band saw 5, the knob bolt 19 is removed from the screw hole 20, and the fixed portion 20 and the movable portion 21 are removed.
The direction to open the movable part 21 by releasing the fixed state of
When the movable portion 21 is rotated in the left direction), the movable portion 21 is held at the position of the chain double-dashed line, that is, in a state of being slightly upward with respect to the driven saw wheel 4, and at the same time, from the saw shaft 12 to the operating portion 21a. The distance becomes longer. Hereinafter, the same operation as that described above is performed.

A third embodiment of the position converting means of the tension lever 18 of the present invention will be described with reference to FIG. FIG. 11 is a sectional view taken along the line AA of FIG. 2 showing the third embodiment.

The position converting means of the tension lever 18 is
It is composed of a movable part 24 having a fixed part 23 and an operating part 24a, and the fixed part 23 is fixed to the saw shaft 12,
A knob bolt 19 serving as a fixing means and a holding hole portion 23a serving as a position converting means are provided at the left end, and the movable portion 24 is inserted into the holding hole portion 23a from the end portion on the side opposite to the operation portion (right end in FIG. 11). The movable portion 24 is bent slightly upward from the vicinity of the center and has a substantially "V" shape, and a pin 25 for preventing the movable portion 24 from coming off from the holding hole portion 23a is provided near the right end of the movable portion 24.

Therefore, normally (when the saw cover 6 is closed), the movable portion 24 is slid to the right, and the knob bolt 19 is tightened to clamp the movable portion 24 so that the fixed portion 23 and the movable portion 24 are fixed. The tension levers 18 are overlapped with each other and the length of the tension lever 18 becomes the shortest, and the tension levers 18 are stored in the saw cover 6. When tensioning the band saw 5, the knob bolt 19 is loosened and the movable portion 24 is slid to the left until the pin 25 comes into contact with the right end of the holding hole portion 23a. This is the position, and the distance from the saw shaft 12 to the operating portion 24a becomes longer.

[0027]

According to the present invention, the distance between the end of the tension lever, which is the operating position, and the center of rotation is changed by the position converting means, and during operation, the distance between the operating section and the saw shaft is increased. You can work with a small operation load. Further, normally, by shortening the distance between the operating section and the saw shaft until the saw cover can be housed in the saw cover when not in use, it can be provided at a low cost without enlarging the machine body.

Further, since the tension lever is bent into a substantially "V" shape, the tension lever operation portion is separated from the frame and the saw wheel when the band is stretched, so that the frame and saw wheel do not come into contact with each other. , The tension lever can be operated.

[Brief description of drawings]

FIG. 1 is a perspective view of a band saw board showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a driven saw wheel and its surroundings showing a tension lever stored state.

FIG. 3 is an enlarged view of a driven saw wheel and its surroundings showing a tension lever operation state.

4 is a cross-sectional view taken along the line AA of FIG.

5 is a cross-sectional view taken along the line CC of FIG.

FIG. 6 is a cross-sectional view taken along the line CC of FIG. 3, showing a state in which the band saw is loosened.

FIG. 7 is a sectional view taken along line BB of FIG.

FIG. 8 is a rear view around the saw shaft showing a state where the band saw is stretched.

FIG. 9 is a rear view around the saw shaft showing a state in which the band saw is loosened.

FIG. 10 is a sectional view taken along line AA of FIG. 2 showing a second embodiment.

FIG. 11 is a sectional view taken along line AA of FIG. 2 showing a third embodiment.

FIG. 12 is a cross-sectional view showing a conventional band sawing device as seen from line AA in FIG.

[Explanation of symbols]

2 ... frame, 4 ... driven saw wheel, 5 ... band saw, 12 ... saw shaft, 12a ... width across flats, 12b ... screw hole, 18 ...
Tension lever, 18a ... elongated hole, 18b, 21a, 2
4a ... Operation part, 19 ... Knob bolt, 20 ... Fixed part, 20
a ... screw hole, 21 ... movable part, 22 ... rotating part, 23 ... fixed part, 23a ... holding hole part, 24 ... movable part, 25 ... pin.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic report Flat 5-74731 (JP, U) Flat 59-74026 (JP, U) Flat 6-31916 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B23D 55/00-55/10 B27B 13/08

Claims (3)

(57) [Claims] 1. A grooved sleeve which slides between two holding members fixed to a frame for accommodating a saw wheel and a band saw, and axially supports a saw shaft for holding the saw wheel. A shaft having one end axially supported by a bolt fixed at a position displaced from the center of the grooved sleeve, and the other end of the shaft inserted through a protrusion formed in the frame, and the end face of the protrusion and A compression spring provided between the other end of the shaft and
A tension lever that makes moving this vehicle is rotated sliding the slotted sleeve to an end portion of the saw shaft, in sawing machines of the band with a saw cover to protect this said this wheel and belt A position converting means for changing the distance between the operating portion which is the operating position of the tension lever and the saw shaft which is the center of rotation, and a fixing means for fixing the tension lever to the saw shaft at an arbitrary position, A band saw tensioning device for a band saw board, wherein the tension lever can be housed in the saw cover when the distance is a predetermined length. 2. When the distance between the tension lever operation portion and the saw shaft is maximized by the position conversion means and the fixing means, the operation position of the tension lever is higher than when the tension lever is accommodated in the saw cover. 2. The band saw tension device for a band saw according to claim 1, wherein the tension lever has a substantially "V" shape. 3. A position conversion means is formed by fitting a slotted hole provided in the tension lever with a width across flat provided in the saw shaft to form a position conversion means, and a screw hole is provided in the saw shaft, and a bolt is provided in the screw hole. Screwing in, and tightening the tension lever
Clamping THIS This tensioning device of the band saws band according to claim 1 or 2, characterized in that the fixing means in Rukoto.